Means for retaining check-valve balls in pistons



C. F. SCHRINER MEANS FOR RETAINING CHECK VALVE BALLS IN PISTONS April 14, 1925.

Filed April 17, 1922 g wmmhz C F Schrizzer Patented Apr. 14, 1925.

UNITED STATES j 1,533,665 ATENT OFFICE.

CHARLES F. SCHRINER, OF CLEVELAND, OHIO, ASSIGNOB TO THE NATIONAL STEEL I l BARREL COMPANY, A CORPORATION OF OHIO.

MEANS non RETAININGCHECK-VALVE BALLS 11v rrsrolvs.

Application filed April 17,

To all whom it may concern:

Be it known that I, CHARLES F. Scrranvnn, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Means for Retaining Check-Valve Balls in Pistons, of which the following is a specification.

This invention relates to means for retaining check-valve balls in pistons of grease pumps and the like, and has for its prin cipal object to provide simple and inoxpen sive means for accomplishing said purpose, which means will'not become loosened by the movement of the piston and score the pump cylinder as frequently occurs when an ordinary pin is driven into a piston for retaining the valve balls in position.

For a clear understanding of the invention reference will be had to the accompanying drawings illustrating the same, and the novel features thereof will be distinctly pointed out in the appended claims.

In the drawings similar characters of reference are used to indicate corresponding parts.

Figure 1 is a side elevation of a grease pump having a piston constructed in accordance with my invention.

Fig. 2 is an enlarged sectional view of the piston, and

Fig. 3 is a plan sectional view taken on line 33 of Fig. 2.

Referring to the drawings, 1 represents the body or cylinder of a pump such as is used for oil, grease and other substances.- The inlet of the cylinder comprises a tube 2 extending from its lower end for fitting into a barrel from which the contents are to be pumped, and at the upper end of the cylinder is a discharge opening indicated at 3. A piston 4- is slidablv mounted in said cylinder, and is provided with one or more cupped out recesses as 5 extending from its upper end 6. These recesses are contracted at the lower end of the piston at 7, and annular beveled shoulders formed at 8 serve for seats for suitable balls indicated by 9, which act as check-valves in the manner well known. The piston 4: is riveted at 10 to the reduced end 11 of a rod 12 having ratchet teeth 13, which are adapted to be engaged by a pinion rotated by means of a crank-handle 14 for reciprocating said piston. A housing 15 extends from the top of the body or cylinder 1922. Serial No. 553,852.

; 1 for enclosing the rod 12 when in its raised position. i

It is necessary to retain the check-valve balls 9 in their recesses 5 when the piston 4 is moved downwardly for the purpose of returning the piston to the bottom of the cylmder so as to be in position for moving upwardly for forcing the oil or grease through I the discharge opening 3 of the cylinder. The usual practice is to drill a hole into the side of the piston and drive a pin therein across each recess, but said pin becomes loosened and the projecting end thereof scores the inside of the cylinder. In order to avoid this objection a member 16 is employed. Said member is provided with a central openingl'r' for fitting over the reduced end 11 of the rod 12, and fingers 18 extending radially therefrom. are adapted to project over the recesses 5 at a suflicient d1stance to retain the check-valve balls 9 therein. To prevent the member 16 turning and thus hold the fingers thereof in a fixed relation to the recesses of the piston, the upper end of the piston is provided with a central depression and slots extending radially therefrom as indicated at 19 for receiving said member and its fingers.

From the drawings and description, it is seen that the check-valve ball retaining means adds but little to the cost of manufacture, is securely held in place with relation to the recesses for the balls, and cannot at any time come in contact with the walls of the cylinder. It will be understood that slightchanges in the details of con structi'on maybe made within the scope of the claims.

Having fully described my invention,

what I claim is:

1. In a device of the class described. the combination of a piston, the piston being provided with a recess extending from one face thereof, a ball in the recess, said face of the piston having a slot extending from said recess, a finger, and the finger being arranged in the slot and extending. over said recess for retaining the said ball therein, substantially as described.

2. In a device of the class des ribed, the combination of a piston, a rod fixed to the piston, the piston being provided with recesses extending from one face thereof, a ball in each recess, a member. the member having an opening for receiving said rod,

the member having fingers for extending over said recesses to retain said balls therein, and said face of the piston being slotted for receiving said fingers to hold said member against rotation, substantially as described.

3. In a device of the class describech the combination of a piston, a rod extending from the upper face of the piston, the piston being provided With recesses extending from the upper face thereof, a ball in each recess, the piston having a depression in its upper face around said rod and slots extending from said depression intosaid recesses, a member, the member having; an opening for receiving said rod, the member being adapted to rest in said depression and the mem her having fingers adapted to rest in said slots and extend over said recesses to retain said balls therein, substantially as described.

In testimony whereof I aflix iny signature.

CHARLES F. SGHRINER. 

